The victim was found suffering from multiple stab wounds on a small patio in the back of the apartment, Middlesex District Attorney Marian Ryan said.

During his arraignment in Waltham District Court, prosecutors described a "vicious attack," and said Remy repeatedly stabbed Martel as he was on top of her.

When Remy was arrested he was covered in blood, prosecutors said.

"There was even one neighbor who sought to intervene. He reached out and tried to pull him off of her, but was unsuccessful, and in fact the defendant turned around and swung his knife at this man," Assistant District Attorney Lisa McGovern said.

"It's really early in the process, but we'll be looking at all of the facts and trying to figure out what to do with all this," defense attorney Peter Bella said.

Bella said Remy had injuries on his head and hands that could be construed as defensive wounds.

"I'm not sure anyone really knows what happened and what started this whole issue. We know how it ended. We don't know how it started," Bella said.

Remy was held without bail and is due back in court next month.

The couple's 4-year-old daughter, who was in the apartment during Friday's confrontation, was unharmed and is now in the custody of child welfare officials, Ryan said.

"She was kind and outgoing. She didn’t have a mean bone in her body. I never saw her being rude to anybody," said Richard Martel, the victim's uncle.

He said Saturday that Jennifer's parents were going to seek custody of the child.

Richard Martel told the Herald News, a WCVB-TV news partner, that his niece dated Jared Remy for about five or six years and their relationship was volatile.

"She had to deal with his attitude, but she loved him and had a child with him. She was a good mother to her baby. She tried to make it work," Richard Martel said.

Police records show that Remy was arrested at the same address on Tuesday and charged with assault and battery.

"Mr. Remy does have an open case from earlier this week. Mr. Remy was released on personal recognizance on Wednesday," Ryan said.

Martel, a Taunton High School grad, told police she and Remy had an argument because he said she was spending too much time at their neighbor's home.

Police said Remy grabbed Martel by the head and neck, and hit her head against the bathroom mirror, according to Wicked Local. She pushed him away, returned to the neighbor’s place and called 911, police said.

"The bail recommendation on Wednesday was made based on the totality of the circumstances, the singular count in that case, as well as conversations with investigating officers and Ms. Martel," Ryan said.

Police reported no visible signs of injury at the time.

"There was an emergency restraining order that was taken out by Miss Martel, however Miss Martel elected not to extend that emergency restraining order," McGovern said.

Fourteen criminal complaints have been filed against Remy in Waltham District Court since 1998. They include eight charges of assault and battery with a dangerous weapon and three assault and battery charges, according to court documents.

Remy was fired from his Fenway Park security job in 2009 after he and another guard were implicated in a steroid use scandal.

State police confiscated steroids from security staffer Nicholas Cyr, who told police he had bought the drugs from Remy, the Globe reported.

At the time, Remy denied being the supplier, but admitted to the Globe that he has used steroids in the past.

In 2005, Remy was arrested and charged with assault and battery after he was accused of beating up his girlfriend at his father's Weston home.

"This morning, we learned of a terrible tragedy. All of us at NESN and the Red Sox, along with Jerry Remy, are filled with grief for everyone involved, and we extend our deepest sympathies to the family of Jennifer Martel," NESN said in a statement.

Jerry Remy's business partner, John O'Rourke, posted a statement on Jerry Remy's official Twitter account

"It's difficult to comment after the news this (morning). Our thoughts and prayers go out to the Martel family," he posted.

NESN said Dennis Eckersley will fill in for Jerry Remy on Friday and next week in San Francisco and Los Angeles.

Meanwhile, a memorial fund has been set up for Jennifer Martel for both funeral expenses and to take care of her daughter. Donations can be sent to: